package servlets.admin.moduleManagement;

import dbProcs.Getter;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import utils.ModuleBlock;
import utils.ShepherdLogManager;
import utils.Validate;

/**
 * Class to manage interaction of an optional blocking module. This is used to prevent users from
 * getting ahead of themselfs. By deafult this is not enabled <br>
 * <br>
 * This file is part of the Security Shepherd Project.
 *
 * <p>The Security Shepherd project is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software Foundation, either
 * version 3 of the License, or (at your option) any later version.<br>
 *
 * <p>The Security Shepherd project is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 * PURPOSE. See the GNU General Public License for more details.<br>
 *
 * <p>You should have received a copy of the GNU General Public License along with the Security
 * Shepherd project. If not, see <http://www.gnu.org/licenses/>.
 *
 * @author Mark Denihan
 */
public class EnableModuleBlock extends HttpServlet {

  private static final long serialVersionUID = 1L;
  private static final Logger log = LogManager.getLogger(EnableModuleBlock.class);

  /**
   * Used to set a limit to the progress a player can make in a CTF environment
   *
   * @param moduleId The identifier of the module that is locked, preventing the user from
   *     continuing in the game
   */
  public void doPost(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    // Setting IpAddress To Log and taking header for original IP if forwarded from proxy
    ShepherdLogManager.setRequestIp(request.getRemoteAddr(), request.getHeader("X-Forwarded-For"));
    log.debug("&&& servlets.module.StopHere &&&");
    PrintWriter out = response.getWriter();
    out.print(getServletInfo());
    HttpSession ses = request.getSession(true);
    Cookie tokenCookie = Validate.getToken(request.getCookies());
    Object tokenParmeter = request.getParameter("csrfToken");
    if (Validate.validateAdminSession(ses, tokenCookie, tokenParmeter)) {
      ShepherdLogManager.setRequestIp(
          request.getRemoteAddr(),
          request.getHeader("X-Forwarded-For"),
          ses.getAttribute("userName").toString());
      if (Validate.validateTokens(tokenCookie, tokenParmeter)) {
        boolean notNull = false;
        String storedResult = null;
        try {
          String applicationRoot = getServletContext().getRealPath("");

          log.debug("Getting Parameters");
          String moduleId = (String) request.getParameter("moduleId");
          ;
          log.debug("moduleId = " + moduleId.toString());
          String blockedMessage =
              Validate.validateParameter(request.getParameter("blockedMessage"), 500);

          String message = new String();
          if (blockedMessage.isEmpty()) {
            message = "Ask your administrator when these modules will be made available";
          } else {
            log.debug("Custom Message Detected");
            message = blockedMessage;
          }
          log.debug("Blocked Message = " + message);

          // Validation
          notNull = (moduleId != null);
          if (notNull) {
            storedResult = Getter.getModuleResult(applicationRoot, moduleId);
          }
          if (notNull && storedResult != null) {
            // Data is good, Module exists! Store it as the Blocking module. Storing the message as
            // well to show
            ModuleBlock.blockerId = moduleId;
            ModuleBlock.setMessage(message);
            ModuleBlock.blockerEnabled = true;
            log.debug("Blocker Enabled on module ");
            out.write(
                "<h3 class='title'>Block Enabled</h3><p>The block has been enabled"
                    + " successfully</p>");
          } else {
            // Validation Error Responses
            if (!notNull) {
              log.error("Null values detected");
            } else if (storedResult == null) {
              log.error("Module not found");
            }
            out.write("<h3 class='title'>Error</h3><p>Invalid data recieved</p>");
          }
        } catch (Exception e) {
          log.error("StopHere Error: " + e.toString());
        }
      } else {
        log.debug("CSRF Tokens did not match");
      }
    } else {
      log.error("Invalid Session Detected");
      out.write("css/images/loggedOutSheep.jpg");
    }
    log.debug("&&& END StopHere &&&");
  }
}
